A(n) is defined as a research design that includes independent and dependent variables and random assignment of participants to control and experimental groups or conditions.

experiment

Explanation:

Experimental research design is an empirical method of research in which subject is observed under control condition. In this research design, we observe the effect of the independent variable on the dependent variable and examine how the manipulation of the independent variable through intervention effects the dependent variable. It is important because it ensure high internal validity.

answer; society;

answer; ///attempts to change more than once behavior at the same time;